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Emmanouil Tzorakoleftherakis


MathWorks

42 total contributions since 2018

Emmanouil Tzorakoleftherakis's Badges

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Answered
Reinforcement Learning Toolbox: DDPG Agent, Q0 diverging to very high values during training
Hi Johan, It makes sense that stopping the training leads to bad actions since the blown-up critic values probably don't lead t...

26 jours ago | 0

Answered
Reinforcement Learning Tool Box : How to change epsilon during training?
Hi Keita, Have a look at this link. The 'EpsilonGreedyExploration' option provides a way to reduce exploration as training prog...

environ 2 mois ago | 0

Answered
Reinforcement Learning Toolbox- Multiple Discrete Actions for actor critic agent (imageInputLayer issues)
Hi Anthony, I believe this link should help. Looks like the action space is not set up correctly. For multiple discrete actio...

environ 2 mois ago | 0

| accepted

Answered
Create policy evaluation function for RL agent
Can you try defining the size of inputs and outputs in the MATLAB Function block? This seems to be coming up a lot in the error ...

environ 2 mois ago | 0

| accepted

Answered
Reinforcement Learning Toolbox - When does algorithm train?
The implementation is based on the algorithm listed here. Weights are being updated at each time step.

environ 2 mois ago | 0

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Answered
RL Toolbox: Proximal Policy Optimisation
Hi Robert, Reinforcement Learning Toolbox in R2019b has a PPO implementation for discrete action spaces. Future releases will i...

2 mois ago | 0

Answered
Training an agent of reinforcement learning as a motor's controller, but Matlab doesn't not do training at all?
Hello, It is hard to pinpoint the problem exactly without a repro model, but sounds like training stops prematurely. Can you re...

2 mois ago | 0

Answered
DDPG - Noise Model - sample time step - definition
Hi Niklas, This post should be helpful. By "sample time step" the documentation refers to the "step count of the RL trainingpro...

4 mois ago | 0

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Answered
Reinforcement Learning Simulink Block Inital Policy
To use the rl agent block, you need to create an agent first, which also requires a policy architecture. When you set up your ne...

4 mois ago | 0

Answered
How to bound DQN critic estimate or RL training progress y-axis
Hello, I believe the best approach here is to figure out why the critic estimate takes large values. Even if you scale the plot...

4 mois ago | 0

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Answered
Reinforcement Learning Simulink Block Inital Policy
If you already have a policy with trained weights, you could just use that directly when creating the agent, instead of creating...

4 mois ago | 0

Answered
How to use CarMaker with Reinforcement learning tool box?
Hi Jin, You can use CarMaker with Simulink. After you set up the Simulink model to work with CarMaker, you use the same proces...

4 mois ago | 0

Answered
reinforcement learning toolbox - q table
Hi Xinpeng, To see the trained table, you have to do is extract it using ‘getCritic’. Try: critic = getCritic(agent); The v...

4 mois ago | 1

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Answered
Reinforcement Learning Toolbox - Change Action Space
Hi Federico, Unfortunately, the action space is fixed once created. To reduce the amount of times an action is selected, you co...

4 mois ago | 1

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Answered
'sim' command error
Hello, I believe that if you install update 1 (or later) of R2019a release, this issue will be resolved.

4 mois ago | 0

Answered
how to create own environment in reinforcement learning
To create a MATLAB environment type rlCreateEnvTemplate('myEnv') This will create a template m file based on the pendulum syst...

4 mois ago | 0

Answered
How to show the progress of the training step in an episode?
Hello, You can use 'getLearnableParameterValues' to get the network parameters after training. Can you share some more detail...

5 mois ago | 0

Answered
How to visualize episode behaviour with the reinforcement learning toolbox?
Hello, To create a custom MATLAB environment, use the template that pops up after running rlCreateEnvTemplate('myenv') In thi...

6 mois ago | 1

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Answered
Reinforcement Learning - Multiple Discrete Actions
Hi Enrico, Try actionPath = [ imageInputLayer([1 2 1],'Normalization','none','Name','action') fullyConnectedLayer(h...

6 mois ago | 0

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Answered
Reinforcement Learning Toolbox - Intialise Experience Buffer
Hi Enrico, Glad to see that Reinforcement Learning Toolbox is helpful. Regarding your comment about algebraic loops, have you t...

6 mois ago | 2

Answered
How can I have several actions for a DQN in the Reinforcement Learning Toolbox?
If you type help rlFiniteSetSpec the second example is spec = rlFiniteSetSpec({[0,1];[1,1];[1,2];[1,3]}) If you define all ...

6 mois ago | 0

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Answered
Loading and saving huge matrices in Simulink
On a separate note, it looks like you are implementing Q-learning (?). Q-learning uses tables, which do not scale well when your...

8 mois ago | 0

Answered
Design a reinforcement learning (RL) based controller to stabilize a quad copter
Hello, Not sure if you are still looking for a solution, but starting in R2019a, you can do deep reinforcement learning directl...

8 mois ago | 0

Answered
How to apply Reinforcement Learning techniques using the Neural Network Toolbox R2018a?
Starting in R2019a, you can do deep reinforcement learning directly in MATLAB and Simulink with Reinforcement Learning Toolbox, ...

8 mois ago | 0

Answered
deep reinforcement learning in MATLAB
Hi Akhil, You can now do deep reinforcement learning directly in MATLAB and Simulink with Reinforcement Learning Toolbox. Ple...

8 mois ago | 0

Answered
Can I extract data from excel filtering a specific search word and its associated value on the next column?
Hi Karla, You can do this by proper indexing of the columns. Please see code sample below: data = {'O2', 5;'oxygen', 3;'...

presque 2 ans ago | 0

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Answered
Power supply design with voltage and current ratings in Simulink
Hi Betha, The following link might be helpful: https://www.mathworks.com/matlabcentral/answers/362232-defining-custom-rang...

presque 2 ans ago | 0

Answered
Does the PowerGui Block, in case of choosing the continuous solver method, solely use a variable-step Simulink solver even if my configuration for the global simulink solver is a fixed-step type?
Hi Christian, From the link below, it is recommended that you implement fixed-step solvers by continuing to use a global vari...

presque 2 ans ago | 0

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Answered
Comparing consecutive png files (video frames)
Hello, Assuming the camera is not moving, then you can use "imread" to read the video frames, which will give you a NxMx3 mat...

presque 2 ans ago | 0

Answered
Is it possible to show Model Browser of a Simulink model programmatically?
Hi Sunny, you can use set_param(gcs, 'ModelBrowserVisibility', 'on')

presque 2 ans ago | 1

| accepted

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